Running on Debian 10, kernel 5.0.21-1, I've tried two adding to
/proc/cmdline both
a) tsc=reliable
b) tsc=unstable
not using one of these options gives a huge time drift to the system.
using A worked, but TSC is not as precise as HPET.
using B is best, because time does not drift and clocksource is now HPET.
Mobo is X11SCM-F, BIOS:
Vendor: American Megatrends Inc.
Version: 1.0b
Release Date: 05/17/2019
Address: 0xF0000
Runtime Size: 64 kB
ROM Size: 32 MB
Characteristics:
PCI is supported
BIOS is upgradeable
BIOS shadowing is allowed
Boot from CD is supported
Selectable boot is supported
BIOS ROM is socketed
EDD is supported
5.25"/1.2 MB floppy services are supported (int 13h)
3.5"/720 kB floppy services are supported (int 13h)
3.5"/2.88 MB floppy services are supported (int 13h)
Print screen service is supported (int 5h)
Serial services are supported (int 14h)
Printer services are supported (int 17h)
ACPI is supported
USB legacy is supported
BIOS boot specification is supported
Targeted content distribution is supported
UEFI is support
ed
BIOS Revision: 5.13
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